Ответ:

  1. \(\frac{7}{20}-\frac{11}{50}=\frac{35}{100}-\frac{22}{100}=\frac{13}{100}\).
  2. \(\frac{17}{33}-\frac{5}{22}=\frac{34}{66}-\frac{15}{66}=\frac{19}{66}\).